Process of ornamenting the surfaces of stones



s. mzzo AND R. clccl'ou.v PR OCESSOF ORNAMENTING THE SURFACES 0F STONES.

. APPLICATION FILED SEPT. 13, 1920. 1,410,721

Patented. Mar. 28, 1922.

awvemto'cS @2207; I

EES

career @FFHQE.

SEBASTIAN O RIZZON AND RAFFAELE CIUCIOLI, OF NEW YORK, N. Y.

PROCESS OF ORNAMENTIN G THE SURFACES F $TONES,

Application filed September 13,

' To all whom it may concern:

Be it known that we, SEBASTIANO RIzzoN and RAFFAELE CIooIoLI, citizensof the United States, residing at 337 East 146th Street, 111 the boroughof Bronx, city and State of New York, have invented new and usefulImprovements in Processes of Ornamentln the Surfaces of Stones, of whichthe following is a specificatio The object of this invention is toprovide a novel means and process for ornamenting the surface of stones,as marble, granite, limestone, with particular reference to cut tingcharacters thereon by sand blasting.

This object is attained by the novel devices and processes hereinafterdescribed and indicated in the annexed drawings, in which Figure 1 is aperspective view of a conventional slab or block of stone, used in ageneric sense, its surfaces being finished and having'disposed upon itthe characters which it is to bear.

Figure 2 is a similar view of the same, but in a further advanced stage.

Figure 3 is a sectional view taken on line 3-3 of Fig. 2.

Figure 4 is another sectional view showing further progress.

Figure 5 is an enlarged fragmentary detail showing a single charactersunk into the surface.

Perhaps the best exposition of the present state of the art iscommercially known as the Scantlebury process, which, in order toclearly understand this invention, is briefly outlined as follows Thefinished stone 10 is mounted on trestles or like supports to present itsupper surface 11 in an essentially level position, and the top wipedfree of dust and the like.

A border or dam 12 is secured around the edges of the stone and the topcovered with a plastic composition 14 in a fluid state, to a uniformdepth of approximately one sixteenth of an inch.

This composition is a commercial article composed of glycerine,gelatine, water and a powder as plaster of Paris, which, after setting.presents a pliable, resilient body, tenacious and similar to rubber;this surface is dusted with plaster of Paris and the outlines of thecharacters marked thereon by stencil or otherwise and out along theirmargins.

If the characters are to be out below the Specification of LettersPatent.

Patented Mar. 28, 11922. 1920. Serial no. 410,062.

It is found by experience that considerable g time is taken by themarking, cutting and removal of the material not required to act as aprotection from the effects of the fine particles of sand or otherabrading material forced under pressure against the stone, and whichrapidly cuts or erodes the uncovered portions, but which due to theelasticity of the covering is caused to recoil upon striking 1t. 7

The final process is to remove the covering whereupon work is-completed.

The cutting of the composition above described is extremely dificult toaccomplish properly, requiring the services pert artisan whose capacityis of necessity limited by the degree of care required in order toproduce finely cut and properly formed characters. An expert in thisfield, working at full speed, can out about one hundred simplecharacters, as a letter of the alphabet, during a working day.

The use of the Scantlebury process involving the cutting last abovedescribed and requiring as shown, the slow, careful labor of an expertin the art, does not result in any material advantage in the way ofadded production over the pristine method, even now in general use, ofcutting the stone directl by hand. In the last mentioned method, an ableartisan can produce about to similar characters, cut by hand directlyinto the stone, per day.

In addition to the time loss, it is also found that the action of thesand blast upon the edges of the composition prevents or makes diflicultto obtain a smooth outlined character upon the stone.

These difficulties are overcome by this invention which includes amaterial change in the process.

In its application the stone 10 is mounted as before with the surface 11uppermost and level. Prints 15 of the characters are previouslyprepared, by moulding or analogous means, of highly friable, brittlematerial when in a dry condition, these characters being secured to theface of the stone by a suitable adhesive, the dam applied, and theliquid composition 14 flowed upon the stone,

surrounding the friable characters 15 the border 12. Iv V Afterthesubstance has set or become'suf ficiently 'firm the stone issubjectedto the action of the sand blast which breaks and crumbles thecharacters and passes through the openings which they formerly occupiedin the protective composition and impinge direct upon the stone, formingthe characters 16;

In order to avoid erosion of the edges adjacent the characters themoulded prints 15 are bevelled at their edges, as shown in Figs. v

3 and 4 so that the openings 17 are narrower at their bases or portionsadjacent the stone than at their outer parts, this shape being found inpractice to produce smooth, true outlines in the out characters.

F mm the foregoing it will be noted that practical departure fromestablished prac-.

tice has been disclosed which produces superior results with a minimumof labor.

Having thus described our invention, what we claimas new anddesire tosecure by Letters Patent, is i v 1 1. The process of forming characterson stone consisting of applyin frangible models and presenting narrowedbases, flowing an elastic protective coating, when in a semiliquidstate, over the stone around and be- I tween the model characterspermitting said coating to become partially dehydrated, and subjectingthe stone with the models and coating to the action of a sand blast.'

' SEBASTIANO RIZZON. RAFFAELE CICCIOLI.

